Means for grinding the mantle surfaces of rollers having arc-shaped generatrices



Yeh 3, 125.

1,525,336 v. A. svENssoN MEANS FOR GRINDIANCT THE MAN'IILE SURF C FROLLERS HAVI G ARC SHAPED GENERA C Fi d OGL. 920

/N VEA/TOR.

Patented F eb. 3, 1925.

UNITED STATES y. 1,525,336 PATENT 'oFFicEg VICTOR A. SVNSSON, OFBROOKLYN, NEW YORK, ASSIGNOR NTO AKTIEBOLAGET SVENSKA-KULLAGERFABRIKEN,OF GOTTENBORG, SWEDEN, A. CORPORATION OF SWEDEN.

MANSFOR GRI'IINDING THE MANTLE SURFACES 0F 'HAVING ARG-SHAPED To allwhom 'it may concern:

Be it known that I, VICTOR ABRAHAM SvENssoN, a subject of the King ofSweden, residing at the city of New York, borough of Brooklyn,l countyof Kings, and State of New York, have invented certain new and usefulImproved Means for Grinding the Mantle Surfaces o'f Rollers Having Arc-Shaped Generatrices, of which the "following is a specification,reference being had therein to the accompanying drawings.

This invention relates to an improved f means for grinding the mantlesurfaces of rollers having arc-shaped generatrix by means of a grindingdisc rotatable in rela- .tion to the rollers. rl`he object of theinvention is to secure an effective, quick, and exact grinding of Cilsuch surfaces/with the aid of simple means in such manner that thegeneratrix ofthe rollers Will be an exact arc of a circle independent ofWhether `the working surface of the grinding disc ,has a correspondingexact form or not.v

The invention consists, chiefly, in this that the rollers during thegrinding operation are brought to roll in such positions that theoutermost generatrices of their mantle surfaces always are contained inaspherical surface, and that the grinding is performed by means of algrinding disc, the Working surface of which is preferably 'formed inaccoidancewith said spherical' surface and the axis of rotation of whichforms an angle with the axis of the roller race.

ln Vthe accompanying drawings Fig. l illustrates the grinding of themantle surfaces of rollers having convex arc-shapedA y generatrix, Fig.2 illustrates the grinding of .concave mantle surfaces. Similar lettersrefer to corresponding parts in both embodiments. y

Referring to Fig. l of the drawings,l 1 is the grind-ing disc which issecured to aA rotary shaft 2. The rollers 3 the convex mantle surfacesof which are to be ground, are mounted in a roller cage or retainer 4:said retainer or cage being secured to a rotary shaft 5 the axis ofwhich forms an angle withn the axis of the grinding disc. The axes ofthe shafts 2 and 5 intersect one another in a point 0 being the centreof the outermost generatries of the rollers LApplication led Octcher 8,1920. Serial No. 415,516.

, the radius of curvature of said gencratrices being R. The roller cage4 is of such form and arrangement that the rollers during the -grindingoperation can rotate about their -respect of their transversal middleplanes the point of-intersection will be positioned at a distance fromthe centre 0, as for instance at a. lf, on5 the contrary, the rollers*are symmetrical in relation to their transversal middle planes, theretainer 4 is to be constructed in 'such manner that said middle planespass through the centre 0.

During the grinding operation the grinding disc is rapidly rotated aboutits own axis while the roller cage and the rollers mounted thereinrotate about the axis of the cage, preferably with a speed which isindependent. of and slower than that of the grinding disc. On accountthereof each point of the outermostgeneratrices of the rollers willcome` in contact with different points of the working surface of thegrinding disc, the result being that the f/said Working surfacemaintains its spherical form in spitepof its wear and that thegeneratrices ofthe rollers become exact circular arcs having .theircentre in 0. i

Fig. 2 illustrates the grinding of rollers having concave mantlesurfaces which are symmetrical in respect of their transversal middleplanes. The working surface of the grinding disc 1 is here convex andpositioned between the centre O and the rollers 3, wheretate about theaxis of the shaft 5 which'intersects the axis of fthe shaft 2 in thepoint j' 0. farming the @entre of the butermost gener:

are R, and at Vthe same time the rollers rotate about their own axes 6in theroller;

cage. f

s the grinding disc is Worn it is fed towards the point 0 by means ofany Wel]- known automatic feeding device in such manner that its Workingsurface maintains a const-ant distance from said centre.

It is evident that the movements above describe-cl are not absolute butrelative only. Accordingly, it Would be ossible to use Va stationarygrinding disc the roller cage is rotated about its own axis as Well asabout the axis of the/ grinding disc.

What I claim is: y

l. The combination, fin a machine dfor grinding rollers Whose peripheryhas an arcshaped generatrix, of a rotating grinder having an annularspllierica-llly curved grindingy surface and a fixed axis 'of rotation,and a Work-,holder rotating on an axis at an angle to the grinder axisand havingan annular raceway shaped to receive the rollers and permittheln to rotate individually about theirf geometrical axis Whilebeing-ground. 2. The combination,` in a machine for grinding rollersWhose periphery has an arcshaped generatrix, of an annular rotatinggrinder having a spherical grinding surface andra. xed axis of rotation,and a Workholder of corresponding contour rotating on an axis atan angleto the grinder axis and having in its peripheral face an annular racewayshaped to receive the rollers and permit them to rotate individuallyabout their geometrical axis While being ground.

n testimony whereof Iliave signed my name. Y i Y o VICTOR A. SVENSSON.

